I have a part in an assembly that has a pipe that I extruded to a length that is an offset from face from another part in the assembly. I did some changing of file names for the parts and as I have been working on the design I noticed that the offset distance was wrong when I measured it in the drawing. When I try to edit the part to change that length I get the message "Cannot use selection. Allowing this selection would create conflicting context" and it won't allow me to select that surface again for my offset. I could just calculate a length and do a blind extrude but the pipe is at an angle and I want the end of the pipe to be parallel with the face I'm trying to offset from and a blind extrude just makes the pipe end perpendicular to the length not parallel to the face. I think the problem has something to do with me changing the file names but I'm not sure. Any thoughts?